A new census of emperor penguins has found that there are roughly twice as many as had been estimated. The new numbers don't change the fact that Antarctic penguins are seriously threatened by climate change. Host Lisa Mullins speaks with Michelle LaRue.

A new census of emperor penguins has found that there are roughly twice as many as had been estimated. The new numbers don't change the fact that Antarctic penguins are seriously threatened by climate change. Host Lisa Mullins speaks with Michelle LaRue.